When I browse my pma__userconfig table, the config_data is syntax highlighted. If I double-click and inline edit some text there, the changed column appears in the standard black font.
Additionally, I'm not sure if this syntax highlighting is specifically coded for the userconfig table, because I'm not able to get any other table to nicely format and change colors; even if I copy this same table to another database the result is standard black text. I'm not sure if that's a bug or a feature.
Image attached
Transformations for information_schema, mysql and config storage database are hard coded. The code responsible for this is https://github.com/phpmyadmin/phpmyadmin/blob/master/libraries/DisplayResults.class.php#L299-L344
This line is the culprit I believe. The code should be reformatted using CodeMirror like here.
Fix: https://github.com/phpmyadmin/phpmyadmin/commit/502b91d8611e816c500bd105ffb38144efd31ed6